If the freeze is close to the drain opening:
If you have tried hot water and applied heat to accessible pipes with no luck after an hour or two, it’s time to call a licensed plumber. They have specialized equipment (like jetting machines that spray hot water inside the line) to locate and thaw deep blockages without damaging your home. frozen drain line
If the pipe is exposed, use a hair dryer or a small space heater to warm the area around the pipe. If the freeze is close to the drain
A: A burst pipe leaks constantly. A frozen drain line only leaks when the furnace/AC is running. frozen drain line
